NC0088331_Permit modification_20070712

Michael F. Easley, Governor
State of North Carolina
William G. Ross, Jr., Secretary
Department of Environment and Natural Resources
Coleen H. Sullins, Director
Division of Water Quality
July 12, 2007
Mr. Timothy A. Buck
County Manager
P.O. Box 158
Bayboro, North Carolina 28515
Subject: NPDES PERMIT REVISION
Permit Number NCO088323
Grantsboro WTP
Permit Number NCO088331
Kershaw WTP
Permit Number NCO088340
Millpond WTP
Permit Number NCO088358
Vandemere WTP
Pamlico County
Dear Mr. Buck:
A review of your recently issued NPDES permits for four Water Treatment Plants revealed
that a limit of 5 mg/ L for Dissolved Oxygen was inadvertently placed on these permits. Attached
is a revised page A.(1) EFFLUENT LIMITATIONS AND MONITORING REQUIRMENTS for
these four permits. Please remove the current Effluent pages and replace with the new pages.
Please note that under the revised Effluent pages, you must monitor and report Dissolved Oxygen,
but there is no limit. There are no other changes.
We apologize for any inconvenience this may cause.
If you have any questions or need additional information, please do not hesitate to contact
Jim McKay of my staff at [phone], extension 595.
Sincere�, Zy/,lu�.
for ; Coleen H. Sullins
cc: Central Files
NPDES Unit Files
Washington Regional Office — Surface Water Protection
Aquatic Toxicology Unit
1617 MAIL SERVICE CENTER, RALEIGH, NORTH CAROLINA 27699-1617 - TELEPHONE [phone]/FAX [phone]
VISIT us ON THE WEB AT http://h2o.enr.state.nc.us/NPDES

•
Permit NCO088340
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on the effective date of this permit and lasting until expiration, the Permittee is
authorized to discharge filter backwash and softener backwash from outfall 001. Such discharges shall be
limited and monitored by the Permittee as specified below:
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Flow
Weekly
Estimate
Effluent
Temperature
1/Month
Grab
Effluent
Salinity.
1/Month
Grab
Effluent
Conductive
1/Month
Grab
Effluent
PHI
21Month
Grab
Effluent
Dissolved Oxygen
1/Month
Grab
Effluent
Total Dissolved Solids
1/Month
Grab
Effluent
Total Suspended Solids
30.0 m /L
45.0 m /L
21Month
Grab
Effluent
Total Residual ChIc6ne2
13 ug/ L
21Month
Grab
Effluent
Total Copper
1/Month
Com osite3
Effluent
Total Chloride
1/Month
Com osite3
Effluent
Total Iron
1/Month
Com osite3
Effluent
Total Manganese
1/Month
Com osite3
Effluent
Total Lead
1/Month
Com osite3
Effluent
Total. Zinc
1/Month
Com osite3
Effluent
Ammonia Nitrogen
1/Month
Com osite3
Effluent
TKN
1/Month
Com osite3
Effluent
NO3-N + NO2-N (mg/ L)
1/Month
Com osite3
Effluent
TO (mg/ L
1/Month
Com osite3
Effluent
Total Phosphorus
2.0 mg/ L
2/Month
Com osite3
Effluent
Whole Effluent To)dcity,
Quarterly
Composite3
Effluent
Footnotes:
1. The pH shall not be less than 6.8 standard units nor greater than 8.5 standard units.
2. The Total Residual Chlorine limit shall become effective on February 1, 2009. Monitoring and reporting
shall begin on the effective date of the permit.
3. The requirement for composite samples will begin on February 1, 2009. Grab samples shall suffice
until that date.
4. TN = TKN + NO3-N + NO2-N, where TN is Total Nitrogen, TKN is Total Kjeldahl Nitrogen, and NO3-N +
NO2-N are Nitrate and Nitrite Nitrogen, respectively.
5. Acute 24-hour Pass/ Fail (Fathead Minnow OR Mysid Shrimp OR Silverside Minnow, Permittee's choice)
at 90%; March, June, September and December; refer to Special Condition A (2).
All samples collected should be from a representative discharge event.
There shall be no discharge of floating solids or visible foam in other than trace amounts.